libcore|Math: Added math functions: mod(), Vector2::cross()

skyjake · Sep 1, 2019 · 54dadc2 · 54dadc2
1 parent f65e3ec
commit 54dadc2
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diff --git a/doomsday/libs/core/include/de/core/vector.h b/doomsday/libs/core/include/de/core/vector.h
@@ -246,6 +246,9 @@ class Vector2
     ddouble dot(Vector2 const &other) const {
         return x * other.x + y * other.y;
     }
+    ddouble cross(Vector2 const &other) const {
+        return x * other.y - y * other.x;
+    }
     Vector2 min(Vector2 const &other) const {
         return Vector2(de::min(x, other.x), de::min(y, other.y));
     }

diff --git a/doomsday/libs/core/include/de/math.h b/doomsday/libs/core/include/de/math.h
@@ -63,6 +63,12 @@ inline Type sign(Type a) {
     if (a < 0) return Type(-1); else return Type(1);
 }
 
+template <typename Integer>
+inline Integer mod(Integer a, Integer b) {
+    const Integer r = a % b;
+    return r < 0 ? (r + b) : r;
+}
+
 /// Minimum of two values.
 template <typename Type>
 inline Type min(Type a, Type b) {